Time-Machine Version History for Obsidian: startup idea with real demand

Time-Machine Version History for Obsidian is a startup idea for Obsidian users. An Obsidian user discovered months of work on one note was silently truncated and reordered by a hotkey or plugin bug, with no standard way to roll back. A thread in r/ObsidianMD drew 178 upvotes and 88 comments between Sep 14, 2026 – Oct 14, 2026. People get by with Obsidian Sync history and obsidian-git plugin, and that still leaves this job open. Hotness is 3.75, Hot. Strong pain. Some willingness to pay. The thread drew 178 upvotes and 88 comments. Gaps in existing tools. A 1-2 week mvp. A first version is weekend-easy, about 2 weeks, priced under $10 a month and charged as a subscription. The pain, the source, the alternatives, the scope notes, and the questions on this page are free to read and free to build from. The agent starter prompt is the paid part. The first slice is on the page. One credit unlocks the rest, to paste into a coding agent, download as Markdown, or send as a private link.

Weekend-easy 2 weeks MVP Plugin verified Oct 14, 2026

Verbatim quotes are added only after a manual check. Until then, the thread title is the excerpt. Exact post date and verbatim quotes pending enrichment.

Who has it

Obsidian users.

What people use now

Obsidian Sync history
obsidian-git plugin

A way through

A plugin/service with Time Machine-style versioning (git under the hood, no git knowledge needed), simple visual diff and one-click rollback.

MVP scope

Give Obsidian users a way to do this in one sitting: Git-powered snapshots with a visual diff and one-click restore, for users who don't know git.
Persist the result and show it again after a reload.
State the empty case when there is nothing to show yet, with one next step.
Charge later with a subscription, under $10 a month. The free path must finish the core job once.
Ship the plugin only. Leave Obsidian Sync history to keep the jobs they already do well.

How it could charge

Subscription · Under $10 a month · B2C · GLOBAL.

Hotness 3.75

4 of 5, Hot. Strong pain. Some willingness to pay. The thread drew 178 upvotes and 88 comments. Gaps in existing tools. A 1-2 week mvp.

Why this score

Pain	4 / 5
Willingness to pay	3 / 5
Demand	4 / 5
Competition gap	3 / 5
Ease of build	4 / 5
Recency	5 / 5

Weights: pain 25%, willingness to pay 20%, demand 20%, gap 15%, ease 10%, recency 10%. Recency is recomputed every build. The source report’s 1–10 score is not shown.

Questions

Is this idea already taken?

People already use Obsidian Sync history, obsidian-git plugin. Those options do not do the job in the solution above. The idea is free to build. Nothing here is an exclusive claim.

How hard is a first version?

Weekend-easy. A tight MVP is about 2 weeks (2 weeks), assuming the regulated or partner-gated parts are stubbed. The paid prompt turns that into tasks.

Who would pay, and how?

The audience is Obsidian users. Charge a subscription, and test a price under $10 a month. Willingness to pay is one input to Hotness, not a promise that someone will buy.

Can I use the evidence?

Yes. Build the product. The thread title is a short excerpt with a link, not a quote we are putting in someone's mouth. Exact post dates and verbatim lines are added only after a manual check. Ideas are suggestions, not medical, legal, or financial advice.

Agent prompt

The first slice is public. The rest is fetched only after you unlock it, and it is not in this page’s HTML.

prd.md

# Agent starter prompt: Time-Machine Version History for Obsidian

You are a senior product engineer. Build only the product described in this document. If a detail is missing, choose the smallest option and write it down in the README. Do not invent a second product, a marketplace of marketplaces, or a growth hack.

## Product
Name: Time-Machine Version History for Obsidian
One line: Git-powered snapshots with a visual diff and one-click restore, for users who don't know git.
Shape: Plugin
AI stance: No AI needed
Region for v1: Global
Hotness (context only, not a requirement): 3.75 (hot). Strong pain; some willingness to pay; thread engagement 178▲/88💬 (demand 4/5); gaps in existing tools; a 1-2 week mvp.

## Problem
An Obsidian user discovered months of work on one note was silently truncated and reordered by a hotkey or plugin bug, with no standard way to roll back.

Who feels it: Obsidian users.

Unlock the rest with 1 credit.

The sister site keeps a free plan and a free growth prompt for the same pain. See the free growth prompt

Productivity & Notes2.75